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Loans and Allowance for Credit Losses - Age Analysis of Past Due Loans by Segment (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | $ 6,949,716 | $ 6,189,148 | $ 6,099,561
Commercial, financial, agricultural and other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 1,736,736 |  | 1,210,936
Real estate construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 452,989 |  | 420,281
Residential real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 1,744,020 |  | 1,666,220
Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 2,215,311 |  | 2,124,240
Loans to individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 800,660 |  | $ 677,884
Acquired Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable Recorded Investment Equal To Or Greater Than Thirty Days Past Due | 3,048 | 3,385 |
Financing Receivable, Not Past Due | 370,828 | 471,390 |
Total | 373,876 | 474,775 |
Acquired Loans [Member] | Commercial, financial, agricultural and other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable Recorded Investment Equal To Or Greater Than Thirty Days Past Due | 112 | 76 |
Financing Receivable, Not Past Due | 25,010 | 29,751 |
Total | 25,122 | 29,827 |
Acquired Loans [Member] | Real estate construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable Recorded Investment Equal To Or Greater Than Thirty Days Past Due | 308 | 0 |
Financing Receivable, Not Past Due | 2,092 | 6,262 |
Total | 2,400 | 6,262 |
Acquired Loans [Member] | Residential real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable Recorded Investment Equal To Or Greater Than Thirty Days Past Due | 2,118 | 2,681 |
Financing Receivable, Not Past Due | 206,953 | 262,873 |
Total | 209,071 | 265,554 |
Acquired Loans [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable Recorded Investment Equal To Or Greater Than Thirty Days Past Due | 369 | 405 |
Financing Receivable, Not Past Due | 126,725 | 158,768 |
Total | 127,094 | 159,173 |
Acquired Loans [Member] | Loans to individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable Recorded Investment Equal To Or Greater Than Thirty Days Past Due | 141 | 223 |
Financing Receivable, Not Past Due | 10,048 | 13,736 |
Total | 10,189 | 13,959 |
Acquired Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 469 | 392 |
Acquired Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Commercial, financial, agricultural and other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 38 | 1 |
Acquired Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Real estate construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 0 | 0 |
Acquired Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Residential real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 397 | 304 |
Acquired Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 0 | 0 |
Acquired Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Loans to individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 34 | 87 |
Acquired Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 642 | 403 |
Acquired Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Commercial, financial, agricultural and other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 0 | 0 |
Acquired Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Real estate construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 0 | 0 |
Acquired Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Residential real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 459 | 207 |
Acquired Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 136 | 107 |
Acquired Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Loans to individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 47 | 89 |
Acquired Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 49 | 257 |
Acquired Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial, financial, agricultural and other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 0 | 1 |
Acquired Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Real estate construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 0 | 0 |
Acquired Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Residential real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 0 | 221 |
Acquired Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 0 | 0 |
Acquired Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Loans to individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 49 | 35 |
Acquired Loans [Member] | Non Accrual Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 1,888 | 2,333 |
Acquired Loans [Member] | Non Accrual Loans [Member] | Commercial, financial, agricultural and other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 74 | 74 |
Acquired Loans [Member] | Non Accrual Loans [Member] | Real estate construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 308 | 0 |
Acquired Loans [Member] | Non Accrual Loans [Member] | Residential real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 1,262 | 1,949 |
Acquired Loans [Member] | Non Accrual Loans [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 233 | 298 |
Acquired Loans [Member] | Non Accrual Loans [Member] | Loans to individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 11 | 12 |
Originated Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable Recorded Investment Equal To Or Greater Than Thirty Days Past Due | 51,110 | 34,741 |
Financing Receivable, Not Past Due | 6,524,730 | 5,679,632 |
Total | 6,575,840 | 5,714,373 |
Originated Loans [Member] | Commercial, financial, agricultural and other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable Recorded Investment Equal To Or Greater Than Thirty Days Past Due | 6,451 | 9,368 |
Financing Receivable, Not Past Due | 1,705,163 | 1,202,658 |
Total | 1,711,614 | 1,212,026 |
Originated Loans [Member] | Real estate construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable Recorded Investment Equal To Or Greater Than Thirty Days Past Due | 54 | 207 |
Financing Receivable, Not Past Due | 450,535 | 442,570 |
Total | 450,589 | 442,777 |
Originated Loans [Member] | Residential real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable Recorded Investment Equal To Or Greater Than Thirty Days Past Due | 9,994 | 11,888 |
Financing Receivable, Not Past Due | 1,524,955 | 1,403,920 |
Total | 1,534,949 | 1,415,808 |
Originated Loans [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable Recorded Investment Equal To Or Greater Than Thirty Days Past Due | 30,751 | 6,950 |
Financing Receivable, Not Past Due | 2,057,466 | 1,951,396 |
Total | 2,088,217 | 1,958,346 |
Originated Loans [Member] | Loans to individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable Recorded Investment Equal To Or Greater Than Thirty Days Past Due | 3,860 | 6,328 |
Financing Receivable, Not Past Due | 786,611 | 679,088 |
Total | 790,471 | 685,416 |
Originated Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 6,503 | 8,643 |
Originated Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Commercial, financial, agricultural and other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 1,978 | 391 |
Originated Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Real estate construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 0 | 198 |
Originated Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Residential real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 2,022 | 3,757 |
Originated Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 517 | 227 |
Originated Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Loans to individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 1,986 | 4,070 |
Originated Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 2,645 | 1,940 |
Originated Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Commercial, financial, agricultural and other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 67 | 57 |
Originated Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Real estate construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 0 | 0 |
Originated Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Residential real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 1,554 | 749 |
Originated Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 122 | 114 |
Originated Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Loans to individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 902 | 1,020 |
Originated Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 1,200 | 1,816 |
Originated Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial, financial, agricultural and other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 17 | 140 |
Originated Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Real estate construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 0 | 9 |
Originated Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Residential real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 458 | 736 |
Originated Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 0 | 0 |
Originated Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Loans to individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 725 | 931 |
Originated Loans [Member] | Non Accrual Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 40,762 | 22,342 |
Originated Loans [Member] | Non Accrual Loans [Member] | Commercial, financial, agricultural and other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 4,389 | 8,780 |
Originated Loans [Member] | Non Accrual Loans [Member] | Real estate construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 54 | 0 |
Originated Loans [Member] | Non Accrual Loans [Member] | Residential real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 5,960 | 6,646 |
Originated Loans [Member] | Non Accrual Loans [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 30,112 | 6,609 |
Originated Loans [Member] | Non Accrual Loans [Member] | Loans to individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | $ 247 | $ 307 |

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